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Naslov:Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system
Avtorji:ID Mori, Nataša (Avtor)
ID Debeljak, Barbara (Avtor)
ID Kocman, David (Avtor)
ID Simčič, Tatjana (Avtor)
Datoteke:URL URL - Izvorni URL, za dostop obiščite http://dx.doi.org/10.1007/s11368-016-1613-0
 
.pdf PDF - Predstavitvena datoteka, prenos (1,12 MB)
MD5: 1F8F083F856871F2BC953C35B61EAC39
 
Jezik:Angleški jezik
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:Logo NIB - Nacionalni inštitut za biologijo
Povzetek:Purpose Increased sedimentation due to land use intensification is increasingly affecting carbon processing in streams and rivers around the globe. This study describes the design of a laboratory-scale flow-through incubation system as a tool for the rapid estimation of sediment respiration. The measurements were compared with those obtained using an in situ closed chamber respiration method. The influence of sediment size on respiration rates was also investigated. Materials and methods Measurements were conducted on a pre-alpine gravel-bed river sediment separated into the following grain size fractions: > 60 mm (14.3%), 60–5 mm (60.2%), 5–2 mm (13.7%), 2–0.063 mm (11.1%) and <0.063 mm (0.6%). Concurrently, in situ and laboratory measurements were carried out on a naturally heterogeneous sediment. In situ respiration was determined in closed chambers as O2 consumption over time, while in the laboratory, respiration was determined using flow-through respiration chambers. Oxygen concentrations were measured using a fibre-optic oxygen meter positioned at the inflow and outflow from the chamber. Results and discussion The mean respiration rates within naturally mixed riverbed sediments were 1.27 ± 0.3 mg O2 dm−3 h−1 (n = 4) and 0.77 ± 0.1 mg O2 dm−3 h−1 (n = 3) for the flow-through chamber system and closed chamber system, respectively. Respiration rates were statistically significantly higher in the flow-through chamber system (t test, p < 0.05), indicating that closed chamber measurements underestimated the oxygen consumption within riverbed sediments. Sediment grain size was found to significantly affect respiration rates in both systems (ANOVA, p < 0.001) with the fine sediment fraction (particle size <0.063 mm) having the highest respiration rate (rflow-through = 51 ± 23 mg O2 dm−3 h−1). The smallest fractions (2–0.063 and <0.063 mm), which represent approximately 12% of total sediment volume, contributed 60% of total respiration. Conclusions The study demonstrated that flow-through respiration chambers more accurately estimate the respiration rate within riverbed sediments than in situ closed chambers, since the former experiment imitates the natural conditions where continuous interstitial flow occurs in the sediments. We also demonstrated that fine sediments (<5 mm) substantially contribute to heterotrophic respiration in the studied gravel-bed river.
Ključne besede:carbon fluxes, freshwaters, geomorphology, hyporheic zone, respiration, sediments
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.01.2017
Leto izida:2017
Št. strani:str. 1939-1947
Številčenje:Vol. 17, iss. 7
PID:20.500.12556/DiRROS-19704 Novo okno
UDK:577
ISSN pri članku:1439-0108
DOI:10.1007/s11368-016-1613-0 Novo okno
COBISS.SI-ID:4134223 Novo okno
Datum objave v DiRROS:24.07.2024
Število ogledov:437
Število prenosov:261
Metapodatki:XML DC-XML DC-RDF
:
MORI, Nataša, DEBELJAK, Barbara, KOCMAN, David in SIMČIČ, Tatjana, 2017, Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system. Journal of soils and sediments : protection, risk assessment and remediation [na spletu]. 2017. Vol. 17, no. 7, p. 1939–1947. [Dostopano 2 april 2025]. DOI 10.1007/s11368-016-1613-0. Pridobljeno s: https://dirros.openscience.si/IzpisGradiva.php?lang=slv&id=19704
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Gradivo je del revije

Naslov:Journal of soils and sediments : protection, risk assessment and remediation
Založnik:Wiley
ISSN:1439-0108
COBISS.SI-ID:15925543 Novo okno

Gradivo je financirano iz projekta

Financer:ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
Številka projekta:L2-6778-2014
Naslov:Primerjalna študija ekosistemskih storitev in upravljanja v kontrastnih rečnih sistemih Slovenije
Financer:ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
Številka projekta:P1-0255-2017
Naslov:Združbe, interakcije in komunikacije v ekosistemih
Financer:EC - European Commission
Številka projekta:603629
Naslov:MANAGING THE EFFECTS OF MULTIPLE STRESSORS ON AQUATIC ECOSYSTEMS UNDER WATER SCARCITY
Akronim:GLOBAQUA

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

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